Cushion for insulator pins and method of applying



Oct. 14, 1930. Aw Y 1,778,154

CUSHION FOR INSULATOR PINS AND. METHOD OF APPLYING Filed Feb. 3, 1927 Patented Get. I i, 1930 STATES PATENT QFFECE KENT A. I-IAWLEY, OF BALTIMGRE, MARYLAND, ASSIGNOR TO LOCI-1E INSULATOR COR- PORATEON, OF BALTIMORE, IIIARYLAND, A CORPORATION Q? MARYLAND CUSHION FOR INSULATGB PINS AND METHOD OF APPLYING Application filed February 3, 1927.

The invention relates to insulators, particu larly that type embodying a dielectric body such as porcelain, having a recess within which is Cemented ametallic pin or its equivalent.

In insulators of many types, for instance pedestal, bus bar, suspension and others, embodying a porcelain body having a recess within which is cemented a suspension pin, supporting post or the like, it has been generally found necessary to provide some sort of cushion or yieldable means interposed between the metal and the cement so as to prevent the bringing of crushing strains upon the cement as the result of thermal changes, and to insure conforming engagement against the cement by filling inequalities which may exist in the surfaces. Ordinarily it has been found that a coating of asphaltum or the like, of course applied in melted condition, is reasonably eflicient. However, in some instances it has been demonstrated that the thickness of such coating is insutlicient at the end of the pin.

It is with the above facts in view that I have designed the present invention which has for its general object the provision of a cushion adapted to be secured upon or attached to the end of the pin, or its equivalent, the invention further contemplating a novel method of and means for holding the cushion in place so that it cannot become displaced or dislocated from its proper position during as sembly of the insulator.

More specifically, the object of the invention is to provide cushioning means in the nature of a disk or pad of yieldable material disposed upon the end of the pin, or its equivalent, and held in place by an adhesive.

Another object of the invention is to provide a cushion or pad or this character which, when used in connection with a hollow open ended pin, post or the like, will act as a dam to prevent the cement within the pin receiving recess from entering the hollow pin itself.

An additional object of the invention is to provide cushioning means and a method of applying the same which will be simple and inexpensive in so far as labor and materials are both concerned, eficient and positive in Serial No. 1(35/550.

use, durable in service, and a general improve ment in the art.

To the attainment of the foregoing and other objects and advantages, the invention consists the detailed structure, the arrangement and combination and the method steps to be hereinafter more fully described and claimed, and illustrated in the accompanyin drawing in which Figure 1 is a sectional View, partly in elevation, of an insulator of the cap and pin type showing the invention applied,

Figure 2 is a similar view of an insulator of the pedestal type embodying a hollow open ended pin and showing the invention applied.

Referring more particularly to the drawing, and especially Figure 1, the numeral 1 designates the porcelain body of a suspension ii ulator of the type having a stem 2 carrying cap 3, the body also having recess within which is secured, by cement 5, a metallic suspension pin The type of cap and pin may of cousre be varied as the details thereof form no part of the present invention which contemplates simply the provision of a cushion to be interposed between the end of the pin and the bottom of the recess within which it is "eceived and secured.

In carrying out the invention 1 provide a pad 7 which may conveniently be a disk of paper, rubberoid r other more or less simil. yieldable material but which is preferably of such a nature as to be impervious to moisture and not subject to disintegration under the influence of the chemicals which are naturally present in the cement used for holding the pin in place. It is preferable that the pad 7 cover the end of the pin, or at leas 'ally so, and it is here reprepractically the same diameter as the pin head. The thickness of the pad is a matter which may be varied and it would naturally depend to a certain extent upon the size of the insulator, its exact type and the character of the installation of which it is a part.

To avoid displacement of the disk with respect to the pin during assembly of the parts of the insulator, it becomes necessary to provi de some means for holding the disk on the onto the side thereof. Experimentation has demonstrated that the most suitable material to use as an adhesive is hot asphalt as it is capable of withstanding the chemicals in the cement. The method of applying need consistonly in coating the end or as much of the pin as desired with the hot asphalt, either by swabbing it .on or by dipping and then inplacing the pad or disk in position. Clearly, as-soon as the asphalt or its equiva lent sets, the pad will be held firmly so that it cannot become displaced during handling of the pin preparatory to or during assembly of the insulator. V

In Figure 2 I have illustrated an insulator of the pin or pedestal type here shown as including a plurality. of nested'porcelain shells 8, 9' and l0ythe latter. of which is formed with a recess 11 for the reception of the pin 12 which may rise from abase or be attached to some support. In some instances, pins of this type are hollow and if so are usually open at the upper end. The invention is carried out in connection with this type of pin in exactly the same manner as above described, the pad 13 being placed in position and securedby the hot asphalt indicated at 14. The employment of such a pad or cushion in connection with an insulator of this type embodying a hollow pin is particularly advantageous in that it not only provides the yielding substance between the metal of the pin andthe bottom of the recess, but also constitutes a dam, seal or closure for the open end of the pin so that when. the insulator is subsequently assembled and cement applied for securing the pin in the recess, the ocment willbe excluded from the interior of the pin.

, From the foregoing description and a study of the drawing it will be apparent that I have thus provided a very simple cushioning means for and method of applying the same toinsulator pins ofall types for accomplishing the desired purpose. The cost of the materials necessary is extremely low and hardly any time or skill will berequired to apply and secure the pads upon the pins. It is really believed that the construction, operation and advantages will be readily apparent to one; skilled in theart without fur-- ther explanation; I

While I have shown and described the preferred embodiment of the invention and have mentioned certain relative sizes and specific materials, it should be understood that there is no particular restriction in these respects and that the right is reserved to make all such changes as will not depart from the spirit of the inventionor the scope of the claims hereunto appended.

Having thus described the invention, I

claimzy I. In an insulator, a porcelain body having cemen ed within the recess, the pin being hollow and havin its end within the recess 0 en 7 O 7 and a disk of yieldable material secured upon the end of-the pin by an adhesive and consti-;

tuting combined cushioning means and dam, the latter purpose being to exclude cement from the interior of the pin.

The method of securing a yieldable pad upon the end of an insulator pin..prior to its cementing within a recessed porcelain body, comprising coating the end of the pin with bituminous material in a hot melted-condition, and placing the pad upon the end of the pin whereby the bituminous material will act as an adhesive. i

4. In insulator, a porcelain body having a recess'therein, a metal pin cemented within the recess, and a yieldable pad secured upon the end of the pin by bituminous adhesive material.

In testimony whereoi I affix my signature.

7 KENT A. HAWLEY. 

